Valve cutting tool



May 30, 1944. F. A. DEXTER 2,350,019

VALVE CUTTING TOOL Filed Sept. 24 1941 2 Sheets-Sheet 1 May 30, 1944. F. A. DEX TER 2,350,019

' V'ALVE CUTTING TOOL I Filed Sept. 24, 1941 2 Sheets-Sheet 2 6 26 I 2 20 .3 g a 27 21 3& 57

Patented May 30, 1944 v UNITED STATES PATENT OFFICE VALVE CUTTING TOOL Frederick A. Dexter, Orange, Mass, assignor to The Leavitt Machine Company, Orange, Mass a corporation of Massachusetts Application September 24, 1941, Serial No. 412,189 4 Claims. (CL 29105) My invention relates to valve cutting tools and ings, I indicates the head ofthe tool which is it has for its principal object to provide a tool provided with a plurality-ofarms 2 and with a which may be easily and quickly adjusted to fit centrally disposed screw threaded socket 3 wherethe seats of valves of a great many different sizes. by the tool maybe easily attached to the lower The invention is particularly useful in cutting end of a shaft (not shown) of conventional mechtapered seats of globe valves for, whereas in the anism (also not shown) for imparting rotation past it has been necessary to stock a great variety thereto. of cutters since a separate cutter was required Mounted on the under side of each of the arms for each different sized valve, two identical cut- 2 is a cutter carrying member 4 which is provided tors are all that is required for a tool embodying am with anupstanding rib 5 fitting within a groove the present invention to cut the valve seats hav- 8 in the under side of the associated arm. Each ing the same degree of taper of all valves falling cutter carrying member is adjustable longitudiwithin a wide range of sizes. nally of the arm on which it is mounted and it A primary feature of the invention consists in is adapted to be securedin a desired position of providing the tool with a head having a plurality adjustment by a screw 7 which'has threaded enof arms on which cutter carrying members are gagement with the cutter carrying member and respectively mounted for longitudinal adjustis m v ble longitudinally 0f the associated arm ment, each arm and its associated member being in a slot 3. Washers 9 are preferably interposed provided with means whereby they may be se1ec= between the heads ll] of the adjusting screws! tively interlocked in a plurality of different posi 2'0 and the top surfaces of the arms 2 so as to bridge tions of adjustment. theslots' 8 and thus enable the bolts to be firmly Another feature of the invention consists in tighten d W th t m ri s r ef in th upper provi ing the coacting surfaces of the arms of surface of the arms. the tool and of the cutter carrying members which As the cutting of valve seats requires precision are adjustable longitudinally thereof with toothed 26 of a high order, it is essential that the cutter poiticns so that the members may be interlocked carrying members are capable of being as imwith their associated arms in a plurality of difmovably'secure'd to the arms of the head of the ierent positions of adjustment. tool as though they formed integral parts of the further feature of the invention consists in arms. Means is, therefore, provided for interproviding the cutter carrying members with pins 30 looking the cutter carrying members with. the or the like which are selectively inSer table within arms to pr vent hem from mov n ev n h apertures in the under sidesof the arms of the smallest amount longitudinally of the arms after tool so that the members may be selectively interbeing secured in a desired position of adJustment, locked with the arms in a plurality of different ti ansverse or lateral movement or the members positions of adjustment. with respect to the arms being effectively pre- Other and more specific features or th .inv vented by the ribs 5 which fit within the grooves tion, residing in advantageous iorms', combine t on the under sides of the arms. tions and relations of parts, will hereinafter In the form of the invention illustrated in Fig appear and be pointed out in the claims. ures l to 3; inclusive the means for interlocking In the drawings, illustrating preferred embodi- 40 the 15 1 Carrying b s a nst movement ments of the invention, longitudinally of the arms consists of toothed or Figure l is a side elevatlonal view of onevf m serrated portions formed on the under sides of of the tool. the arms laterally of the grooves thereof and Figure 2 is a longitudinal vertical sectional view similarly formed toothed'or serrated portions on of the tool illustrated in Figure l. v r the upper surfaces of the cutter carrying mem- Figure 3 is a sectional view tak n 3&3 bers laterally of the ribs thereof; The teeth on of Figure 2. i both the arms and the cutter carrying members Figure 4 is a side elevatlonal view of another are of the same shape and size and they are enform of the invention. gageable with each other so that, after the screws Figure 5 is a plan view of the tool illustrated l have been firmly tightened, the cutter carrying in Figure 4. members are interlocked withthe arms 2 and are Figure dis a sectional view taken on line 6-4 thus fi ti-v ly pr ven fr m m ving lon ituof Figure 5. dinally of the latter. The distance between the Referring more particularly to the tool lllusteeth may be conveniently as small as a sixteenth trated in Figures 1 to 3, inclusive, of the drawof an inch so thatarather fine adiustment of the cutter carrying members is possible, and to assist in adjusting the cutter carrying members for a valve of predetermined size a scale such as that indicated at H may be advantageously provided on the tool head, the particular scale illustrated being graduated in sixteenths of an inch and being for a tool whose cutters may be set for cutting valve seats ranging from 3% inches to inches in diameter;

The cutter or cutting blades l2 are respectively secured by the members 4 by screws [3. The particular cutting blades illustrated in the drawings are fora tapered valve seat and they preferably fit within grooves M in the under sides of the members 4 with their inner endsabutting against stop pins l5 which are rigid with the j members 4 and extend downwardly into the grooves M. It will thus beflseen that,v although the cutters l2 are detachable from the members i so that cutters of varying design and taper maybe appliedthereto the means for securing the ,cuttersto the members 4 is suchas to rigidly andfixedlysecure the cutters. in place.

Toenable the teeth to be easily cut inthe up-- persurfaces of the cutter carrying members on opposite sides of the ribs! thereof, the ribs are formed as separate parts instead of being formed integrally with-the cutter carrying members. To this end, the upper portion of each cutter carrying member is-formed with a groove l6 for receiving the rib-iwhich'mayberigidly secured in-placeby-the screw 13 employed for connecting the cutter to the member; The rib is, of course, not secured-to the cutter carrying member until-after the teeth have been cut on the uppersuifacethereof and, in the absence of the rib,=the teeth'may' be easily and quickly cut;

-Inthe formof the invention illustrated in Figures4'to'6 of the drawings, the tool comprises ahead havingradial arms 2| and a centrally disposed screw threaded'socket 22 for receiving the lower end of an operating shaft (not shown). As in the form of the inventionillustrated in Figures 1' to"3, inclusive, cutter blade carrying members 23 are mounted on the arms for "adjustment' longitudinally thereof, "each of the member'shaving an upstanding rib '24 fitting within'agroove 25 formed o'n'the under side of the associated arm. The cutter carrying members are adapted to be secured to'the arms in'a desired'position of adjustment by screws 26 which have threa'ddengagement with the members but are movable longitudinally of the arms within 'slots 21. Washers 28 may be conveniently'interposed between the heads of the screws 26 and the upper surfaces of the arms 2| so as toafiord an ex tended bearing area for the screw heads.

Detachably secured to each of the cutter carry ing members 23 is a cutter or cutting blade 29 of any suitable shape or configuration. The cutter which preferable extends into a groove formed in the under side of its carrying member with its inner end abutting against a stop pin 3!],may be easily and rigidly secured to themember by To selecfvely interlock each cutter carrying member with the arm on which it is mounted in aplural ity of difierent positions of adjustment, each arm is provided on its under side with a plurality of sets of apertures 32 respectively disposed on opposite sidesoi the groove 25 thereof, iheapertu n on deo t ee-mo being arranged in staggered relationwith the apertures on the other side of the groove. Each of the cutter carrying members is provided with a plurality of pins or dowels 33, one for each set of apertures in the arm with which it is associated. However, as the apertures of the two sets of apertures of each arm are arranged in staggered relation with respect to each other, the pins or dowels 33 are movably mounted so that the pin for one set of apertures will not interfere with the insertion of the other pin in the apertures of the other set. To enable the pins to be easily forced into an inoperative position by contacting with the under surface of the arms, each is movably mounted within a recess or the like 34 which is adapted to be closed atone end by a removable plug 35 and is formed at the other end with a shoulder 35 affording an abutment for a peripheral flange 31 on the inner end of the pin. A compression spring 38 is interposed between the inner end of the pin and the removable plug 35 for normally maintaining the pin in an operative position, as shown at the left hand side of Figure 6. The spring, however, is of such strength that the coacting pin may be easily forced into an inoperative position as shown at the right hand side of Figure 6.

By providing the cutter carrying members with spring pressed pins for respectively cooperating withapertures arranged in staggered relation along opposite sides of the arms, the cutter car-'- rying members may be interlocked in a greater number of different positions of adjustment with the arms than would be possible if each arm was provided with only a single row of apertures.

From the ioregoing, it will be perceived that a simple and yet reliable valve cutting tool has been devised in which the cutter members may be 'adjustablysecured in a most effective manner in a great many different positions of adjustment so that the tool may be readily used with a great many difierent sizes of valves. Those skilled in the art will readily perceive that various changes and modifications may be made in detail features of construction of the tool without departing from the spirit and scope of the invention as defined in the appended claims.

What I claim is: l 1. An adjustable valve cutting tool including a head having a plurality of arms respectively provided on-their under Sides with grooves extending longitudinally thereof, cutter carrying members respectively mounted on and adjustable longitudinally of said arms, each of said cutter carrying members having a groove in its upper surface, an elongated member secured within the groove of each cutter carrying member and projecting upwardly therefrom into the groove on the under side of the arm with which the cutter carrying member is associated, each cutter carrying member being also provided with toothed portions on opposite sides of the elongated member secured thereto so that it may be selectively interlocked with the arm on which it is mounted in a plurality of different positions of adjustment, and means for detachably securing each of said cutter carrying members to its associated arm in a desired position of adjustment.

2. An adjustable valve cutting tool including a head having a plurality of arms respectively provided on their under sides with grooves extend-' ing longitudinally thereof, a longitudinally adjustable cutter carrying member mounted On each of said arms and having an upwardly extending rib fitting within the groove thereof, the under side of each arm being provided with a set of apertures on each side of the groove thereof, the apertures of the set on one side of the groove being in staggered relation with the apertures of the set on the opposite side of the groove, spring pressed pins carried by each of said members for respectively cooperating with the set of apertures in the arm with which the member is associated, the pins of each member being movable into inoperative positions so that when one of said pins is disposed within an aperture of one of the sets of apertures of the associated arm the other pin will assume an inoperative position, and means for detachably securing each of said members to its associated arm in a desired position of adjustment.

3. An adjustable valve cutting tool including a head having a plurality of arms, each of said arms having a groove extending longitudinally thereof on its under side, a cutter carrying member mounted on the under side of each of said arms and having an upstandin rib fitting within the groove thereof, the under side of each of said carrying members being provided With a longitudinally extending groove, a cutter disposed within the groove of each member and projecting beyond the outer end thereof, means having threaded engagement with each cutter and extending downwardly through the top wall of the groove in the member on which the cutter is mounted for detachably securing the cutter and member together, said members being respectively adjustable longitudinally of said arms and each of said members bein provided laterally of the ribs thereof with means engageable with the arm on which it is mounted for selectively interlocking the member with the arm in a plurality of different positions of adjustment, and means for detachably securing each of said members to its associated arm in a desired position of adjustment.

4. An adjustable cutting tool including a head having a plurality of arms respectively provided on their under sides with longitudinally extending grooves, an adjustable cutter carrying member mounted on the under side of each of said arm and havin an upstanding rib fitting within the groove thereof, the under side of each of said carrying members being provided with a longitudinally extending groove, a cutter disposed within the groove of each member and projecting beyond the outer end thereof, means having threaded engagement with each cutter and extending downwardly through the top wall of the groove in the member on which the cutter is mounted for detachably securing the cutter and member together each of said members respectively having transversely extending teeth on opposite sides of the rib thereof and the under surface of each of said arms having transverse teeth for coacting with the teeth of the member carried thereby so that said members may be selectively interlocked with their associated arms in a plurality of different positions of adjustment, and means for detachably connecting each of said members to its associated arm in a desired position of adjustment.

FREDERICK A. DEXTERQ 

